National Dental Examining Board of Canada (NDEB) Practice Exam 2025 - Free NDEB Practice Questions and Study Guide

Question: 1 / 400

How long does it take bacterial plaque to form acid from sucrose?

1-5 minutes

2-10 minutes

Bacterial plaque is a sticky, colorless film that forms on the teeth and contains bacteria that feed on the sugars in food. When these bacteria consume sucrose, a common type of sugar found in sweets and processed foods, they produce acid as a byproduct. This acid can eventually lead to tooth decay. The formation of acid from sucrose can happen within minutes, but it typically takes around 2-10 minutes for enough acid to accumulate to start damaging the tooth enamel. Therefore, B is the most accurate answer.

The other options are incorrect because they either overestimate or underestimate the time it takes for acid to form from sucrose. A, 1-5 minutes, is too short of a time frame for enough acid to accumulate and cause damage. C and D, 10-20 minutes and 30-60 minutes, respectively, overestimate the amount of time

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10-20 minutes

30-60 minutes

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